Throat plate for sewing machines



March 10, 1931. K. MAIER THROAT PLATEV FOR SEWING MACHINES Filed 0G11. 3, 1927 Patented .Mart l0, i931 irse srresA means KARL MAIER, OF STUTTGART, GERMANY, ASSIGNOR T UNION SPECIAL MASCHINEN- FABRIK, G. IVI. B. H.

THR-OAT PLATE FOR SEWING MACHINES Applicationled October 3, 1927, Serial No.

The invention relates to new and usefulk improvements in throat plates for sewing machines, and more particularly to the construction of a supporting tongue which pro- 5 jects into the needle slot and over which the stitches may be formed. n j

An object of the invention is to provide a throat plate having means for detachably supporting a tongue which projects into the needle slot, so that the tongue is held from lateral movement, and at the saine time may be readily adjusted in an endwise direction and removed so that other tongues may be substituted therefor. Y A further object of the invention is to pro- K vide a throatplate of the above type wherein the stitch tongue is in the form of a relatively thin plate having a laterally projecting portion by which it is secured and held in 2c vertical position, and wherein the throat plate is also provided with means for clamping the laterally projecting portion of the tongue and supporting the tongue at the sides thereof adjacent the needle slot. p

A further'obj ect of the invention is to provide a throat plate of the above type having two tongues with a connecting bridge portion whereby said tongues are clamped to the throat plate.

These and other objects will in part be ob-v vious and will in part be hereinafter more fully disclosed.

In the drawingsv j f Figure l is a perspective view of the throat 35 plate embodying the invention;

. Fig. 2 is a view partly in end elevation and partly in transverse section of the same;

Fig. 3 is a longitudinal sectional view through a portion of the throat plate;

Fig. 4 is a perspectiveview of the supporting tongues removed from the throat plate; Fig. 5 is a perspective view of a modified KYform of supportingtongue, and Fig. 6 is a view partly in end elevation and 45 partly in section showing supporting tongues 223,782, and in. Germany Gctober 25, 1926.

of the typeillustrated in'Fig. 5 attached to the throat plate.

The invention isv directed broadly to a` throat plate for sewing machines, and more particularly to the construction of throat plate which provides a supporting tongue or tongues over which the stitches may be formed. The throat plate has the usual needle slot, and directly in line with the needle slot and in front thereof, the throat plate is provided with a groove in which vthe supporting tongue may be placed. The groove eX- tends toward the front of the throat plate and joins the laterally extending recessed portion. the supporting tongue is in the forni of a thin metal plate which may be placed in the groove, and theplate has a laterally extending portion which lies in the recess. A clamping block is placed on the laterally extending portion in the recess, and serves to clamp they VVlhen two stitch tongue to the throat plate. tongues are used, they be provided with projecting` portions which face each other, and a single clamping block used for both projections. These projecting portions may be joined, thus forming an integral connecting bridge between the tongues. ln this latter case, the bridge is formedwvith a slot through which the clamping screw for the block passes, and this slot is elongated so as to permit the tongues to be adjusted in an endwise direction. l

Referring more indetail to the drawings, the throat plate is indicated at a and is pro" vided with the usual feed slots and c. The threat plate is also provided with the usual needle slots d. in the present embodiment of the invention there are two needle slots. The throat plate is secured to the cloth plate ofthe machine by screws passing through the usual openings c. VvWhen there are two needle slots, `then two supporting tongues are used, and tnese are indicated in the drawings at f. ln the-form of the invention illustrated in Figures l to il, inclusive, the two tongues f, f are connected by a bridging portion g. Vl`his bridging portion g is formed integral with the to es, and projects laterally from the main body portion of the tongues. Each tongue is in form of a relatively thin metal plate. The forward end Z extends into the needle slot, and is tapered on the under face thereof, so that the stitches when they are foi red about the ends of the tongues, will slide off from the tongues the fabric is fed across the throat plate. The throat plate is provided withgrooves in which these tongues are located, and these grooves form supporting portions p, p along each side of the respective tongues adjacent the forward ends thereof. rlie grooves are in line with the needle slots Iand parallel with the line of feed. 'lll e grooves entend into the connectmg recess portion .7a. Tie groove adjacent the needle slot entends all the way through the throat plate, and the-tongue is extended downwardly indicated in, so as to give a relatively wide support to the tongue adjacentthe needle slot. This supporting of the tongue the sides thereof, 'events the tongue from lateral movement or tilting movement due to the pulling of the threads on the tongue. rl`he bridge portion g lies in the recess ZL. A block z' is placed on top of the bridge portion, and a screw* 7c passes through the block and threaded into the throat plate. This screw /v lills the space between the body portions n, n of the tongues, and thus it is that the tongues are substantially supported against lateral movement or tilting throughout their entire length. By loosening the screw 7c and releasing the block, the tongues may be adjusted in an endwise direction, and then clamped in any set position. By removing the block, the tongues may be readily removed from the throat plate and other tongues substitutec therefor.

its shown in the drawings, these tongues are of such a width as to project above the surface of the throat plate. rlhis is for the purpose of forming a rib on the fabric which is being' stitched. The tongues may be constructed so as to project in trie manner shown,

` or may be made flush with the throat plate, as

they are desired. rllhe above construction also provides means whereby the tongues may be quickly taken out when defective stitch formation occurs, and ground so as to remove any ridges forming thereon, and then again easily inserted for use.

ln Figures 5 and 6 of the drawings, l have shown a slightly modified forni ofthe invention, in that the tongues are separately constructed. rlhe tongues are similar to those described above, except for the co necting bridge portion g. nstead of having the single int gral bridge portion, each ton is provided with lateral projections These lateral projections r face each other and are of such width that when the tongues are in place, they may be clamped by the block z', and the shank of the screw lies between the projecting portions r. By the above construction, it will be apparent that the tongues may be independently adjusted in a longitudinal direction. Also one tongue may be removed and another sul' 'tituted therefor, or one tongue entirely removed from the inachine and only one tongue used.

1i.While l have shown and described in detail the use of twotongues, it will be understood that a single tongue may be used such as shown, for example, in Figures 5 and 6, and with all of the advantages which have been described above.

lt is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what l claim as new and desire to secure by LettersiUatent, is

l. A throat plate for sewing machines having a needle slot, a groove in line with said slot, a relatively thin plate fitting in said groove and having a portion projecting into saidneedle slot over which the stitches may be formed, said plate projecting above the surface of the throat plate, and means for detachably securing the plate in said groove.

2. A throat plate for sewing machines having a needle slot and a groove in line with said slot, a supporting tongue iitting in said groove and projecting into said needle slot, said tongue having an integral laterally proj ecting shank portion at the outer end thereof extending into a recess formed in the throat plate, said tongue projecting above the surfaceof the throat plate, and a clamping block adapted to engage said Shank and clamp the tongue to the throat plate.

3. A throat plate for sewing machines having a pair of needle slots, a groove in line with each needle slot, a supporting tongue located in each groove, a connecting shank portion joining said tongues at their lower edges and extending into a recess formed in the throat plate, said tongues projecting into said needle slots, and mea-ns disposed in Said recess for engaging said connecting shank portion for clamping the tongues in said slots.

t. A throat plate for sewing machines having a pair of needle slots, a groove in line with each slot and a recess into which said groove extends, a supporting tongue located in each groove and extending into a respective needle slot, a shank portion connecting the lower edges of said tongues and located in said recess, a block adaptdto rest on said shank portion and lill said recess, and a clamping screw for said block, said shank having an elongated slot formed therethrough whereby said tongues may be adjusted in an endwise direction.

llU

5. A throat plate for sewing machines having a needle slot and a groove in line with said slot, a relatively thin plate tting in said groove and projecting above the sur- Jface of the throat plate, said thin plate having a portion projecting into the needle slot and having a laterally projecting portion extending into a recess formed 1n the throat plate, and a clamping block secured in said recess for clamping the laterally projecting portion and holding the tongue in said groove.

In testimony whereof, I affix my signature.

KARL MAIER. 

